light bulb savings calculations

these calculations display your estimated savings based on assumptions below

for customized calculations enter your own data in the green fields

Wattage
3 watts
Rated Lifetime
15,000 hours
price
$14.95
average incandescant (INC) light bulb
Wattage
watts
Rated Lifetime
hours
price

cost per kilowatt hour
bulb use per day hours

how your savings are calculated

step 1 find the number of INC bulbs needed over this bulb's lifetime

15000 / 750 = 20

step 2 determine the cost of replacement INC bulbs and the difference with this bulb's cost

20 * $0.50 = $10.00 cost of replacing the INC bulb

$10.00 - $14.95 = ($4.95) replacement savings

step 3 determine energy usage over the life of this bulb

25 watts * 15000 hours / 1000 watts per kW = 375 kWh

3 watts * 15000 hours / 1000 watts per kW = 45 kWh

step 4 subtract to find the difference in energy usage between the bulbs

375 kWh - 45 kWh = 330 kWh lifetime savings

step 5 find the lifetime energy cost savings

330 kWh * $0.118 = $38.94

step 6 combine energy savings with replacement cost savings to find total lifetime savings

$38.94 + ($4.95) = $33.99 total lifetime savings

step 7 find savings per year

5 hours per day * 365 days per year = 1825 hours per year

1825 hours per year / 15000 lifetime hours = 12.17 % of bulb life used per year

12.17 % * 330 kWh lifetime savings = 40.15 kWh yearly savings

12.17 % * $33.99 lifetime savings = $4.14 yearly savings

Savings calculations are presented as an example of potential savings; actual savings may vary based on use, utility rates and other factors. Calculations are based on national averages and assumptions and may be adjusted for a more accurate estimate of individual savings. While EnergyEarth strives to provide the most accurate information, we cannot guarantee the savings displayed.